What to grade, what to sell, what to hold.
Sereal is where a card goes after you add it — break cost basis, a grading pipeline that runs the grade-or-don’t math, and a sell desk that ranks what to move next. Comps get re-pulled and flagged stale, so the call isn’t built on a number from two seasons ago.
Invites go out in batches · AGPL-3.0, self-hostable
A card has a life after you add it.
Most of us started in a spreadsheet. It holds the numbers fine — it just won’t tell you the comp went stale, whether the slab clears its grading fee, or which card to list this week. That’s the part Sereal is built for.
Pulled from a break? It carries a real cost.
Buy three spots in a $400 case and Sereal splits the cost across the cards you actually pulled — so each one carries a real basis instead of $0. Import the Whatnot CSV and it reconciles for you.
Grade it, or don’t — with the math.
Before you mail it, Sereal lines up the raw comp against the graded comp at each grade and shows the expected value. Sometimes the verdict is Skip. Submit, and it rides the pipeline — Queued, Submitted, back as a slab.
What to move next, ranked.
The sell desk surfaces stale listings, trim candidates, and lot candidates — comp beside cost — with one tap to lower, watch, or drop into a lot. No scrolling the whole collection to find the one to list.
The ones you keep, shown like they matter.
Showcase turns the keepers into a photo-led gallery — graded slabs and key issues front and center, the data tucked behind the image. The part of the hobby that’s just for you.
It all sits on a collection you actually maintain.
Every card and comic, its cost basis, and its current comp in one place. The total value and P&L roll up here too — that’s the floor the rest stands on, not the pitch.
Every card and comic, with comps, cost basis, and P/L. The table the rest reads from.
Where it rolls up — current value, total in, and net P/L at a glance.
Prefer to run it yourself? You can.
Sereal is a Next.js app on Supabase, licensed AGPL-3.0. Self-hosting is a supported way to run it — your own Supabase, your own eBay key, one collection per install. It assumes you’re comfortable with Docker; there’s no installer wizard yet, and the public build is still being packaged.
- Your database, your backups. Point it at your own Supabase. Nothing leaves a machine you control.
- Nothing held back. No paid tier — the comp and grading logic sit in the same repo as the rest.
- Export is just the database. It’s your data in plain Postgres. Leave whenever you want, with all of it.
Get on the list.
The cloud app is invite-only while it’s in alpha. Drop your email and we’ll send an invite as soon as a batch opens up.
Have an access code? Sign up · Already invited? Sign in · Self-hosting? Read the license